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This function is already defined in spi.h but no implementation of it currently exists in the tree. The implementation is based on the static function spi_set_speed_mode(). The function prototype is modified so that an success or error condition can be returned to the caller. Signed-off-by: Paul Barker <paul.barker@sancloud.com> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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